Brake arrangement for six-wheel trucks.



J. C. WHITRIDGE & G. T. JOHNSON.

. BRAKE ARRANGEMENT FOR SIX WHEEL TRUCKS.

APPLICATiON FILED. MAY 9,1917 1332 144, Patented July 3,1917.

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W/TZVESSES I V [V7018 J.C.WH|TR1DGE& G. T. JOHNSON. BRAKE ARRANGEMENTFOR SIX WHEEL TRUCKS.

APPLICATION FILED MAYB, 1917.

1 ,232, 1 4:4,, Patented July 3, 1917.

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f P "I 3% i nnrrnn snares ra'rnivr oration JOHN C. WHITRIDGE AND GEORGET. JOHNSON, OF COLUMBUS, OHIO, ASSIGNORS TO THE BUCKEYE STEEL CASTINGSCOMPANY, OF COLUMBUS, OHIO.

BRAKE ARRANGEMENT FOR SIX-WHEEL TRUCKS.

Specification of Letters Patent.

Patented. uly 3, 1917.

Original applicationfile'd April 21, 1916, Serial No. 92,639. Dividedancl this application filed May 9, 1917. i I Serial,1 Io.167,515

To all whom it may concern 1 Be it known that we, JOHN G. VVHrrnmeE andGnoncn T. JoHNsoN, citizens of the United States, and residents ofColumbus, in the county of Franklin and State of Ohio, have inventedcertain new and useful Improvements in Brake Arrangements for SIX-TVheel Trucks; and we do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilledin the art to which it appertains to make and use the same.

Our invention relates to an improvement in brake arrangementfor sixwheel trucks adapted particularly for use with thetruck shown in PatentNo. 1,158,741granted to us September 11th 1915, and is a division ofapplication Serial Number 92,639 filed by us April 21st, 1916. I

The object of the invention is to provide a construction that will becomparatively simple and that will equalize the brake pressure on allthe wheels at the same time, and it consists in the parts andcombinations of parts as will be more fully described and pointed out inthe claims.

In the accompanying drawings; Figure 1 is a view in plan of a truckembodying our invention; Fig. 2 is a view in side elevation of the same,and Figs. 8 and 41- are views in plan and side elevation respectively ofa modified form.

This improvement is designed particularly for wheel trucks wherein amain bolster 8 is supported at its ends on the auxiliary bolster 9 and10.

The main bolster 8 extends lengthwise the truck and is mounted at itsends on seats formed in or on the auxiliary bolsters 9 and 10. Theselatter bolsters extend transversely of the truck, one being located in aplane between the axle l5 and the middle axle 12, and the other betweenthe middle axle 12 and the axle 16, and each is preferably providedwithan opening located centrally with relation to its ends for thereception of the ends of the main bolster 8 The brake beams 17 are hungfrom the truck side frames and the brake shoes18 are keyed to the brakebeams in the usual manner.

In the construction shown in Figs. 1 and 2 the brake beams 17 areactuated by the levers 19, disposed. diagonally so that their upper endsare to onesidc of the main bolster 8, and all connections between thelevers and the chains or rod from the brake actuating mechanism will beat one side of the main bolster and in a plane above the auxiliarybolster, and readily accessible and clear of all parts of the truck.

The lever 19 located between the middle axle l2 and the auxiliarybolster 10 is pivoted to the bracket 10 and is connected at its lowerend to its brake beam by the compression member 25, and at its upper endwith the upper end of the lever 19 intermediate the central axle 12 andauxiliary bolster 9, by the tension member 2%. The levers l9 at'oppositesides of the auxiliary bolster 9 are pivotally connected intermediatetheir ends, to their respective brake beams 17, and are connected attheir lower ends by the compression member 20, the upper end of thelever 19 at the outer side of the auxiliary bolster 9 being free for theattachment thereto of the brake mechanism of the car. i

The floating levers 19 at the opposite sides of the auxiliary bolster 9preferably pass through the looped guides 24 secured to said bolster,which guides operate to prevent any undue sidewise or swinging movementof the levers.

The construction shown in Figs. 3 and 4c is identical with that shown inFigs. 1 and 2 except that the levers 19 are arranged in pairs, two toeach brake beam and are vertical instead of diagonally disposed.

lVith this construction it will be seen that when a pulling stress isexerted on the upper ends of the lever or levers at the outer side ofbolster 9, the brake shoes of all three brake beams will be forced intocontact with their respective wheels, and as the entire equipment isflexible, the brake pressure on all the wheels will be the same, byproperly proportioning the various levers.

In each of the above forms the brake mechanism is wholly outside of themain and auxiliary bolsters, and is consequently readily accessible forrepairs or readjustment, and with the arrangements shown it is possibleby properly proportioning the levers to equalize the brake pressure orget the same brake pressure on all the wheels at the same time.

It is evident that many slight changes might be resorted to. in therelative arrangement of parts shown and described without departing fromthe spiritand scope of our invention. Hence we would have it understoodthat we do not wish to confine ourselves to the exact construction andarrangement of parts shown and described, but

Having fully described our invention what we claim as new and desire tosecure by Letters-Patent, is 2-,

1. In a brake rigging for six wheel trucks, the combination of a mainbolster and auxiliary bolsters supporting the main bolster, a leverhaving a pivot point between its extremities, a compression memberconnecting the lower'end of said lever with a brake beam, a tensionmember connecting the upper end of said lever with theupper end of asecond lever, a second brake beam pivotally connected to said secondlever between the extremities thereof, a compression member pivotallyconnecting the lower end of the latter lever with the lower end of athird lever, and a third brake beam pivotally connected to said thirdlever between the extremities thereof, the upper end of said third leverbeing free for the attach,-

ber pivotally connecting the lower ends of V the latter levers with thelower ends of a third pair of levers, and a third brake beam pivotallyconnected to said third pair of le- 1 vers between the extremitiesthereof, the

upper ends of saidlatter levers being free for the attachment of thebrake mechanism of the car body.

In testimony whereof, We have signed this 7 specification in thepresence of two subscribing wltnesses.

JOHN o. WHITRIDGE. GEORGE T. JOHNSON-- Witnesses:

JOHN LEYSHON,

C. E. EBERT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

